SYX661-CSC Commissioning Guide
V1.1 10/2020
Page 12 of 17
continue running after the end of any heating period. Pump run-on will operate at the end of any programmed time
period, extended time period, frost period or when the manual switch overrides the heating off.
If not required, pump run-on can be disabled by setting the run on time to 0 minutes.
7.4
Valve Exercise
The Valve will be driven, aiming for the mid position for 1 minute every inactive day at midnight.
7.5
Pump Exercise
The Heating Pump will be run for 2 minutes at midnight during periods of non-use.
7.6
Heating Time Extension (CSC-V-T)
An external button (latching type like SyxthSense LAP5) connected to pin 8 will directly start a time extend period when
the input closes. The external timer/input is not interlocked with the time schedule and acts directly.
7.7
Summer Winter Time Change and Leap Years
This is fully automated. Leap years are fully accommodated into the Calendar and no user adjustment is required.
7.8
Flow Temperature High Limit
The SYX661-CSC-V-T controller has a high flow temperature limit feature. This uses the flow max set point setting
and adds a 5
’C offset to this value. If the flow sensor rises above the limit set point then the heating will be switched
to off mode and an alarm will be raised/alarm output makes. Should the flow temp then fall by 5
’C below the Flow Max
limit value then the heating will be re-enabled. The controller will record High Limit events so these can be investigated
and reasons can be reviewed. The default offset is 5
’C and has a 30 second time delay into and out of alarm.
